negative comments

When someone share a negative comments about your friend would you head straight to tell him? I received some negative comments about my friend lately and was told to keep quite about it. I was wondering if i should share the comments with him? I have to admit that i agreed with certain part of the comments. It's kind of true that his been kind of weird lately, but in order to last both side of the friendship i decided to keep my mouth shut for the moment. Probably one day I would be able to share these comments with him at a right place and time.